Auth bypass in Chevereto
CVE-2026-122326
Chevereto before 4.5.8 contains an authorization bypass vulnerability in the get-album-contents action of the /json route that allows unauthenticated attackers to list private albums by supplying another user's album id. Attackers with a session token from any public page and an album's encoded id can obtain image filenames, viewer and direct file URLs, and download private images.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/chevereto/chevereto (product)
- github.com/chevereto/chevereto/blob/4.5.7/app/legacy/routes/json.php (technical-description)
- github.com/chevereto/chevereto/blob/4.5.7/app/src/Legacy/Classes/Listing.php (technical-description)
- github.com/chevereto/chevereto/commit/fe56eb789ecf5e26c84068ba7d88b7a20ea65f5c (patch)
- github.com/chevereto/chevereto/issues/136 (issue-tracking)
- github.com/chevereto/chevereto/releases/tag/4.5.8 (release-notes)
- hackmd.io/@hieund/chevereto-get-album-contents-private-album-image-disclosure (third-party-advisory)
- www.vulncheck.com/advisories/chevereto-before-4.5.8-private-album-image-disclos… (third-party-advisory)
- 134c704f-9b21-4f2e-91b3-4a467353bcc0
Frequently asked questions
- What is CVE-2026-122326?
- CVE-2026-122326 is a medium-severity vulnerability in Chevereto, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 5.3/10. Published 2026-11-05.
- How severe is CVE-2026-122326?
- Medium severity. CVSS v3 base score is 5.3 out of 10.